Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 ax cip1780
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DI-197
DIAGNOSTICS - AUTOMATIC TRANSAXLE
DI0CZ-19
DTC P1780 Park/Neutral Position Switch Malfunction
CIRCUIT DESCRIPTION
The park/neutral position switch detects the shift lever position and sends signals to the ECM.
The ECM receives signals (NSW, R, 2 and L) from the park/neutral position switch. When the signal is not
sent to the ECM from the park/neutral position switch, the ECM judges that the shift lever is in D position.
DTC No. DTC Detection Condition Trouble Area
When driving under conditions (a) and (b) for 30 seconds or
more, the park/neutral position switch is ON (N position). S Short in park/neutral position switch circuit
P1780 (2-trip detection logic) S Park/neutral position switch
(a) Vehicle speed: 70 km/h (44 mph) or more S ECM
(b) Engine speed: 1,500 - 2,500 rpm
2001 SIENNA (RM787U)
Author : Date : 351
DI-198
DIAGNOSTICS - AUTOMATIC TRANSAXLE
WIRING DIAGRAM
Combination Meter ECM
Park/neutral
Start Switch
C10 6 C10 5 C10 3
5 D Y J7 J/C L-W R-B 13
4 Y Y D D Y
IH2 E10 L
13 3C
6 3 12 14
2 3 L-W L-W O
IH2 3C 3C E10 2
J7 J/C
J/B NO. 3 B 8
4
8 R-B R-B B B R-B
IH1 E10 R
B
J6 J/C To Back-up Light Relay 20
11
GR 6 5 B-W B-W C C B-W
IH1 E9 NSW
C
B-W Driver Side J/B No. 1 IG Switch
R-L D12 DIODE J7 L/C
3 STARTER 4
7 A R 8 ST2 AM2 7
R-L* 1 GR*1 1J 1K
IH1
2 3 A A
3 IH1
GR*1
1 P*1 Driver Side J/B No. 1
GR 1 GAUGE 1
F R-L* 2 4 IG1 AM1 2
J7 L/C 1J 1K
Engine Room No. 2 B-Y
6 CIG 6
L 3
F 2 2 1J 1K
W ACC
2D 2L
3 AM2 4
Driver Side J/B No. 1
2B 2L W
GR 1 AM1 2
ST Relay W-L
MAIN 1B 1K
5
1 2 1 2
2D 5 5
W W-R
1B 1K
11 9
2J 2K
To Starter
Driver Side J/B No. 1
W-B
W 8 7 4
F8 Fusible Link Block W-B W-B
IG1 1G 1V
INP ALT FL MAIN
4 Battery IG
1
*1 w/ Door Lock Control
*2 w/o Door Lock Control D09085
2001 SIENNA (RM787U)
Author : Date : 352
DI-199
DIAGNOSTICS - AUTOMATIC TRANSAXLE
INSPECTION PROCEDURE
1 Read PNP, REVERSE, 2ND and LOW signals.
When using TOYOTA hand-held tester.
PREPARATION:
(a) Remove the DLC3 cover.
(b) Connect a TOYOTA hand-held tester to the DLC3.
(c) Turn the ignition switch ON and TOYOTA hand-held tes-
ter main switch ON.
CHECK:
Shift lever into the P, R, N, 2 and L positions, and read the PNP,
REVERSE, 2ND and LOW signals on the TOYOTA hand-held
tester.
OK:
Shift position Signal
2 2ND OFF ON
L LOW OFF ON
R REVERSE OFF ON
P, N NSW OFF ON
When not using TOYOTA hand-held tester.
ON
PREPARATION:
2 R NSW Turn the ignition switch ON.
L CHECK:
Measure voltage between each of terminals NSW, 2, L and R
of ECM and body ground when the shift lever is shifted to the
L following positions.
(-) (+) OK:
D10344 NSW-Body R-Body 2-Body L-Body
Position ground ground ground ground
P, N 0V 0V 0V 0V
R 9 - 14 V* 9 - 14 V* 0V 0V
D 9 - 14 V 0V 0V 0V
2 9 - 14 V 0V 9 - 14 V 0V
L 9 - 14 V 0V 0V 9 - 14 V
HINT:
*: The voltage will drop slightly due to lighting up of the back up
light.
OK Check and replace the ECM
(See page IN-31 ).
NG
2001 SIENNA (RM787U)
Author : Date : 353
DI-200
DIAGNOSTICS - AUTOMATIC TRANSAXLE
2 Check park/neutral position switch.
PREPARATION:
(a) Jack up the vehicle.
(b) Remove the park/neutral position switch.
CHECK:
Check continuity between each terminal shown below when the
shift lever is moved to each position.
Shift Position Terminal No. to continuity
P 2-7 5-6
D02331
R 2-8 -
N 2-9 5-6
D 2 - 10 -
2 2-3 -
L 2-4 -
OK:
There is continuity.
NG Replace the park/neutral position switch.
OK
Repair or replace harness and connector between battery and park/neutral position
switch, park/neutral position switch and ECM (See page IN-31 ).
2001 SIENNA (RM787U)
Author : Date : 354
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